Uncategorized

  1. Physics

    Fit to Be Tied

    Two new books present scathing critiques of string theory, which holds that the universe has 11 dimensions and that its fundamental building blocks are ultratiny loops of energy known as strings.

    By Peter Weiss
  2. Planetary Science

    Ring Shots

    With the sun poised behind Saturn, the Cassini spacecraft recently got a unique view of the rings' icy dust particles, enabling it to discover two new rings and confirm the presence of two ringlets.

    By Ron Cowen
  3. Planetary Science

    Web Special: Clay magic on Mars

    NASA's Mars Reconnaissance Orbiter has just completed a week of picture taking from as low as 300 kilometers above the surface of the Red Planet.